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Thread: Excessive sway on 5th wheel

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    Excessive sway on 5th wheel

    Purchased new Sailum 235/85/R16 tires one month ago for my 35’ Big Country. Soon as I hit the highway on my trip, it started swaying bad at 50 mph. Slow down and it goes away. I can get up to 60-65 and then it will start again. Let off the pedal and it will stop. Didn’t change anything but the tires. Never did this before with other tires. Stayed as plan on trip hoping it would stop but hasn’t. Really does it almost every time accelerating up a incline. Any ideas or past history on this out there. Plan on taking back to tire shop and checking it out when I return.

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    Re: Excessive sway on 5th wheel

    The Sailun tires that you bought are actually very good tires although there is the possibility of having a failure.
    In the mean time I would check the air pressure, 110 psi, and the torque of the lugs, 125 foot pounds.
    Please update this thread when you find the problem.

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    Moderator danemayer's Avatar
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    Re: Excessive sway on 5th wheel

    I seem to remember some past discussion about some tires not being a good match to the width of some rims. Maybe you're mismatched.


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    Re: Excessive sway on 5th wheel

    Thought that might be the problem on air pressure. Ran at 110, then 100 and now at 90. Still same problem. Torque is good. Will up date if and when problem solved.


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    Moderator danemayer's Avatar
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    Re: Excessive sway on 5th wheel

    If you got the Sailun S637T, the spec sheet calls for 6.5" rim width.


    Dan and Ann Mayer & fur baby Callie the Rally Dog
    2011 Landmark Rushmore
    • MorRyde 8K Independent Suspension
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    Senior Member wdk450's Avatar
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    Re: Excessive sway on 5th wheel

    When you say "swaying" do you mean the trailer fishtailing side-to-side, or the trailer vertically swaying left-right as it goes down the road???

    Have you extensively checked out your suspension system? Bad springs or shock absorbers??
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    Re: Excessive sway on 5th wheel

    Did you match load range of the new tires to the old tires or did you go up or down? First thing to know is that your wheel width within the tires specs, preferably matching the optimum width. Next is knowing your specific wheel weights. That would help you set the tire pressure to the correct PSI to match your load.

    Over inflating the tires can cause a smaller foot print (in tire terms “contact patch”) which may be the reason for the sway. Or lack of pressure to carry the load can create a “squirm” causing the sway. Lastly, I’m assuming you installed trailer tires and not light truck tires. Typically light truck tires have a deeper tread depth then tires designed for trailer applications. This can also result in tread squirm until the initial tread depth starts to wear.

    A number of years ago when Bridgestone introduced their new drive tires for semi’s, M726, it came with 32/32nds of tread. At first a number of drivers complained about the squirm as a feeling the truck was on ice. Once the tires wore down the first 4-5 32nds the truck settled down and the tires wore like iron. The 726 have been the gold standard for drive tires for years.

    Lastly you may want to jack up each wheel position, loosen the lug nuts, then making sure that the wheels are contacting their mounting surface squarely, tighten and torque the lug nuts in a star fashion to the recommended torque specs.
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    Re: Excessive sway on 5th wheel

    After my long trip,I took trailer back to tire shop and had him balance all four tires. That helped a lot but still not perfect. Can run 70 mph with no sway, but still get some here and there. Trailer parked at our spot in south Texas for the remainder of winter. No trips planned till next September. Will post again if I find anything else wrong. Thanks for the feed back


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    Founding Texas-West Chapter Leaders TravelTiger's Avatar
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    Re: Excessive sway on 5th wheel

    Are you towing level? If not that could be contributing to the sway.


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    Senior Member Bones's Avatar
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    Re: Excessive sway on 5th wheel

    My thought is the tires may be bringing to light another issue in the suspension or bearings



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